Question

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Explanation:

Analyze the sentence context

Using the Spanish Contextual Verb Selection knowledge point
The sentence states: "Soy hijo único (an only child). Es decir, yo no [blank] hermanos (siblings)."
"Hijo único" means "only child," which logically implies having zero siblings.
The verb meaning "to have" in Spanish is tener.

Conjugate the verb

Using the Spanish Verb Conjugation knowledge point
The subject pronoun is "yo" (I).
The present tense conjugation of tener for "yo" is tengo.
Thus, the complete sentence is: "Soy hijo único (an only child). Es decir, yo no tengo hermanos (siblings)."

Answer:

Soy hijo único (an only child). Es decir, yo no <blank>tengo</blank> hermanos (siblings).